@proceedings{van2013amsterdam,
  title = {Amsterdam as a Sustainable European Metropolis: Integration of Water, Energy and Material Flows}
  author = {Van Der Hoek, J P; Struker, A; Danschutter, J E M},
  publisher = {Factor X: Challenges, Implementation Strategies and Examples for a Sustainable Use of Natural Resources},
  url = {http://repository.tudelft.nl/assets/uuid:310557b6-c673-4e8b-a452-b0cdb9b1cef3/298688.pdf},
  year = {2013}
}